Poly(dicarbon monofluoride) (C2F)n bridges the neutron reflectivity gap - Archive ouverte HAL Access content directly
Journal Articles Carbon Year : 2024

Poly(dicarbon monofluoride) (C2F)n bridges the neutron reflectivity gap

Batiste Clavier
Cole Teander
Brigitte Vigolo
Claire Hérold
Marc Dubois

Abstract

Graphites covalently intercalated with fluorine to form (C2F)n structural type compounds shows a dramatic increase of the interlayer distance up to by a factor of almost 3 to reach ∼9 Å. Such graphite fluoride compounds containing only carbon and fluorine offer the rare opportunity to bridge the so-called gap in the reflectivity of neutron reflectors. Slow neutron reflectors are of great interest in designing neutron sources as well as in fundamental and applied science; they require synthesizing high thermal and chemical compound stability graphite fluorides. In this work, a new strategy is proposed for synthesizing (C2F)n compounds in a well-controlled method. Our results show that the outcome (C2F)n has a covalent character with only sp3 hybridized carbon atoms. Moreover, C-F bonds in the fluorocarbon sheets and CF2 groups on the sheet edges lead to the desired stability and hydrophobic character. A dedicated home-made neutron diffractometer was built for measurements of double-differential neutron cross sections of crystals with specific large interlayer distances found in (C2F)n compounds. We demonstrate that the synthesized fluorine intercalated graphites developed effectively cover the gap in the reflectivity for the new generation of neutron reflectors.
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Dates and versions

hal-04577690 , version 1 (16-05-2024)

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Valery Nesvizhevsky, Killian Henry, Louise Dauga, Batiste Clavier, Sylvie Le Floch, et al.. Poly(dicarbon monofluoride) (C2F)n bridges the neutron reflectivity gap. Carbon, 2024, 227, pp.119249. ⟨10.1016/j.carbon.2024.119249⟩. ⟨hal-04577690⟩
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